support for multible browsers and proxies

examples/per_page_proxy.js

@@ -0,0 +1,76 @@
+const puppeteer = require('puppeteer');
+const ProxyChain = require('proxy-chain');
+
+const ROUTER_PROXY = 'http://127.0.0.1:8000';
+
+// SEE: https://github.com/GoogleChrome/puppeteer/issues/678
+// Idea is: Setup a local router proxy that assigns requests identified by unique user-agent strings
+// distinct upstream proxies. With this way it is possible to use one proxy per chromium tab.
+// downside: not fast and efficient
+
+const uas = [
+    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36',
+    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36',
+];
+
+const proxies = ['http://142.93.57.147:3128', 'http://85.132.31.115:8181'];
+
+(async () => {
+    const browser = await puppeteer.launch({
+        headless: false,
+        args: [`--proxy-server=${ROUTER_PROXY}`],
+    });
+    const page1 = await browser.newPage();
+    const page2 = await browser.newPage();
+
+    try {
+        await page1.setUserAgent(uas[0]);
+        await page1.goto('https://www.whatsmyip.org/');
+    } catch (e) {
+        console.log(e);
+    }
+
+    try {
+        await page2.setUserAgent(uas[1]);
+        await page2.goto('https://www.whatsmyip.org/');
+    } catch (e) {
+        console.log(e);
+    }
+
+    //await browser.close();
+})();
+
+const server = new ProxyChain.Server({
+    // Port where the server the server will listen. By default 8000.
+    port: 8000,
+
+    // Enables verbose logging
+    verbose: true,
+
+    prepareRequestFunction: ({
+                                 request,
+                                 username,
+                                 password,
+                                 hostname,
+                                 port,
+                                 isHttp,
+                             }) => {
+        var upstreamProxyUrl;
+
+        if (request.headers['user-agent'] === uas[0]) {
+            upstreamProxyUrl = proxies[0];
+        }
+
+        if (request.headers['user-agent'] === uas[1]) {
+            upstreamProxyUrl = proxies[1];
+        }
+
+        console.log('Using proxy: ' + upstreamProxyUrl);
+
+        return { upstreamProxyUrl };
+    },
+});
+
+server.listen(() => {
+    console.log(`Router Proxy server is listening on port ${8000}`);
+});